Oxalonitrile

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

yes

Remarks:

Due to the fact that under normal conditions, ethanedinitrile is a gaseous substance, the recommended method (Method A.1 Melting/Freezing temperature, Annex to Regulation No 440/2008) is not applicable and it is necessary to use a modified procedure.

Principles of method if other than guideline:

Due to the fact that under normal conditions, ethanedinitrile is a gaseous substance, the recommended method (Method A.1 Melting/Freezing temperature, Annex to Regulation No 440/2008) is not applicable and it is necessary to use a modified procedure based on this document.

Ethanedinitrile from the sample container was slowly introduced into a glass container with the volume of approx. 10 ml, fitted with a temperature sensor (TTK-50, Anton Paar), cooled in a dry ice/acetone bath (-78 °C). After accumulating a sufficient amount of solid EDN, the inlet was closed and the container was removed from the cooling bath and moved to a larger test tube to avoid condensation of air humidity on its external surface and to limit the speed of heat exchange (heating of the container). Temperature measured by means of sensor with an accuracy of 1 mK was recorded in time. The temperatures corresponding to the delay of transition from solid to liquid phase (melting) and from liquid to gaseous phase (evaporation, boiling) were then determined from the records. Simultaneously with the experiment, the value of absolute atmospheric pressure was measured by a mercury barometer.
The results were processed statistically.

GLP compliance:

no

Type of method:

method to determine freezing temperature

Test material

Test material information

Constituent 1

Reference substance name:

Oxalonitrile

EC Number:

207-306-5

EC Name:

Oxalonitrile

Cas Number:

460-19-5

Molecular formula:

C2N2

IUPAC Name:

carbononitridic cyanide

Test material form:

gas

Results and discussion

Melting / freezing point

Key result

Melting / freezing pt.:

>= -28.5 - <= -27.9 °C

Atm. press.:

101.3 kPa

Applicant's summary and conclusion

Conclusions:

m.p. of ethanedinitrile is -28.2 ± 0.3°C at atmospheric pressure

Executive summary:

The data for determination of melting point was obtained experimentally. Due to the fact that under normal conditions, ethanedinitrile is a gaseous substance, the recommended method (Method A.1 Melting/Freezing temperature, Annex to Regulation No 440/2008) is not applicable and it is necessary to use a modified procedure based on this document. Ethanedinitrile from the sample container was slowly introduced into a glass container with the volume of approx. 10 ml, fitted with a temperature sensor (TTK-50, Anton Paar), cooled in a dry ice/acetone bath (-78 °C). After accumulating a sufficient amount of solid EDN, the inlet was closed and the container was removed from the cooling bath and moved to a larger test tube to avoid condensation of air humidity on its external surface and to limit the speed of heat exchange (heating of the container). Temperature measured by means of sensor with an accuracy of 1 mK was recorded in time. The temperatures corresponding to the delay of transition from solid to liquid phase (melting) and from liquid to gaseous phase (evaporation, boiling) were then determined from the records. Simultaneously with the experiment, the value of absolute atmospheric pressure was measured by a mercury barometer. The results were processed statistically.

Melting point of ethanedinitrile is -28.2±0.3°C at atmospheric pressure.